@kingsize thank you.
I think you're a pro and I'm just a newbie, I'm here trying to learn and I think I'm in the wrong place.
Is there anyone who can direct me to tutorials or forums where I can find my answer.
Since the html is fixed, I manually add that field to the html code. so far no problem. however, if I go back to the interface screen from the code screen and make a change and save it, the "if visible" fields are broken. The "id" values of the fields I have customized disappear. this must be a mistake